The 15-port dock includes many of the ins and outs you’d expect: Two thunderbolt ports, four USB 3.0 ports, 3.5mm audio in and out (front and back), FireWire 800, Gigabit Ethernet, and two eSATA ports. However, there are two features this 15-port Thunderbolt docking station has that most others do not: extra space to install a 2.5-inch or 3.5-inch SATA HDD or SSD and your choice of a built-in DVD or Blu-Ray drive:

the Echo 15 Thunderbolt dock has you covered—it includes your choice of DVD±RW drive, or Blu-ray Disc™ player (BD-ROM/8x DVD±RW). If you are a Mac user, you’ll also find that the included Blu-ray player software for OS X® is very handy, enabling you to watch Blu-ray movies on your computer or attached monitor.

The fast 6 Gb/s SATA interface supports an HDD at its maximum speeds, and an SSD at up to 380 MB/s… Best of all, the drive sits inside the Echo dock, so you don’t have to clutter your desk space with an external hard drive and its power brick and cable clutter to add more storage. Don’t feel like adding a drive yourself? Sonnet also offers the Echo 15 Thunderbolt Dock equipped with a 2TB HDD, available exclusively through the Sonnet online store.